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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [math/] [ef_atanh.c] - Rev 1767
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/* ef_atanh.c -- float version of e_atanh.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== * */ #include "fdlibm.h" #ifdef __STDC__ static const float one = 1.0, huge = 1e30; #else static float one = 1.0, huge = 1e30; #endif #ifdef __STDC__ static const float zero = 0.0; #else static float zero = 0.0; #endif #ifdef __STDC__ float __ieee754_atanhf(float x) #else float __ieee754_atanhf(x) float x; #endif { float t; __int32_t hx,ix; GET_FLOAT_WORD(hx,x); ix = hx&0x7fffffff; if (ix>0x3f800000) /* |x|>1 */ return (x-x)/(x-x); if(ix==0x3f800000) return x/zero; if(ix<0x31800000&&(huge+x)>zero) return x; /* x<2**-28 */ SET_FLOAT_WORD(x,ix); if(ix<0x3f000000) { /* x < 0.5 */ t = x+x; t = (float)0.5*log1pf(t+t*x/(one-x)); } else t = (float)0.5*log1pf((x+x)/(one-x)); if(hx>=0) return t; else return -t; }
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